/// <summary>
/// Find the OSLC Query Capability URL for a given OSLC resource type. If no resource type is given, returns
/// the default Query Capability, if it exists.
/// </summary>
/// <param name="serviceProviderUrl"></param>
/// <param name="oslcDomain"></param>
/// <param name="oslcResourceType">the resource type of the desired query capability. This may differ from the OSLC artifact type.</param>
/// <returns>URL of requested Query Capablility or null if not found.</returns>
public string LookupQueryCapability(string serviceProviderUrl, string oslcDomain, string oslcResourceType)
{
QueryCapability defaultQueryCapability = null;
QueryCapability firstQueryCapability = null;
HttpResponseMessage response = GetResource(serviceProviderUrl, OSLCConstants.CT_RDF);
if (response.StatusCode != HttpStatusCode.OK)
{
throw new ResourceNotFoundException(serviceProviderUrl, "QueryCapability");
}
ServiceProvider serviceProvider = response.Content.ReadAsAsync <ServiceProvider>(formatters).Result;
if (serviceProvider != null)
{
foreach (Service service in serviceProvider.GetServices())
{
Uri domain = service.GetDomain();
if (domain != null && domain.ToString().Equals(oslcDomain))
{
QueryCapability[] queryCapabilities = service.GetQueryCapabilities();
if (queryCapabilities != null && queryCapabilities.Length > 0)
{
firstQueryCapability = queryCapabilities[0];
foreach (QueryCapability queryCapability in service.GetQueryCapabilities())
{
foreach (Uri resourceType in queryCapability.GetResourceTypes())
{
//return as soon as domain + resource type are matched
if (resourceType.ToString() != null && resourceType.ToString().Equals(oslcResourceType))
{
return(queryCapability.GetQueryBase().OriginalString);
}
}
//Check if this is the default capability
foreach (Uri usage in queryCapability.GetUsages())
{
if (usage.ToString() != null && usage.ToString().Equals(OSLCConstants.USAGE_DEFAULT_URI))
{
defaultQueryCapability = queryCapability;
}
}
}
}
}
}
}
//If we reached this point, there was no resource type match
if (defaultQueryCapability != null)
{
//return default, if present
return(defaultQueryCapability.GetQueryBase().ToString());
}
else if (firstQueryCapability != null && firstQueryCapability.GetResourceTypes().Length == 0)
{
//return the first for the domain, if present
return(firstQueryCapability.GetQueryBase().ToString());
}
throw new ResourceNotFoundException(serviceProviderUrl, "QueryCapability");
}
/// <summary>
/// Return the registered ServiceProvider's.
/// </summary>
/// <returns></returns>
public ServiceProvider[] GetServiceProviders()
{
// We first try for a ServiceProviderCatalog
ServiceProviderCatalog serviceProviderCatalog = getServiceProviderCatalog();
if (serviceProviderCatalog != null)
{
return(serviceProviderCatalog.GetServiceProviders());
}
// Secondly we try for a ServiceProvider which is acting as a ServiceProvider registry
ServiceProvider serviceProvider = GetServiceProvider();
if (serviceProvider != null)
{
Service[] services = serviceProvider.GetServices();
if (services != null)
{
QueryCapability firstQueryCapability = null;
QueryCapability firstDefaultQueryCapability = null;
for (int serviceIndex = 0;
((serviceIndex < services.Length) &&
(firstDefaultQueryCapability == null));
serviceIndex++)
{
Service service = services[serviceIndex];
QueryCapability[] queryCapabilities = service.GetQueryCapabilities();
if (queryCapabilities != null)
{
for (int queryCapabilityIndex = 0;
((queryCapabilityIndex < queryCapabilities.Length) &&
(firstDefaultQueryCapability == null));
queryCapabilityIndex++)
{
QueryCapability queryCapability = queryCapabilities[queryCapabilityIndex];
Uri[] resourceTypes = queryCapability.GetResourceTypes();
if (resourceTypes != null)
{
for (int resourceTypeIndex = 0;
((resourceTypeIndex < resourceTypes.Length) &&
(firstDefaultQueryCapability == null));
resourceTypeIndex++)
{
Uri resourceType = resourceTypes[resourceTypeIndex];
if (OslcConstants.TYPE_SERVICE_PROVIDER.Equals(resourceType.ToString()))
{
if (firstQueryCapability == null)
{
firstQueryCapability = queryCapability;
}
Uri[] usages = queryCapability.GetUsages();
for (int usageIndex = 0;
((usageIndex < usages.Length) &&
(firstDefaultQueryCapability == null));
usageIndex++)
{
Uri usage = usages[usageIndex];
if (OslcConstants.OSLC_USAGE_DEFAULT.Equals(usage.ToString()))
{
firstDefaultQueryCapability = queryCapability;
}
}
}
}
}
}
}
}
if (firstQueryCapability != null)
{
QueryCapability queryCapability = firstDefaultQueryCapability != null ? firstDefaultQueryCapability : firstQueryCapability;
Uri queryBase = queryCapability.GetQueryBase();
// Foundation Registry Services requires the query string of oslc.select=* in order to flesh out the ServiceProviders
string query = queryBase.ToString() + "?oslc.select=*";
OslcRestClient oslcRestClient = new OslcRestClient(client.GetFormatters(),
query);
return(oslcRestClient.GetOslcResources <ServiceProvider>());
}
}
}
return(null);
}
